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Flow and Combustion Characteristic in an Array of Multiple Pre-Mixed Methane/Air Flame Jets

메탄/공기 다중 제트 예혼합 화염에서의 유동과 연소특성

  • 김영수 (LG전자 DAC 연구소) ;
  • 이대래 (LG전자 DAC 연구소) ;
  • 하만영 (부산대학교 기계공학부, 기계기술연구소) ;
  • 장영준 (부산대학교 기계공학부, 기계기술연구소) ;
  • 전충환 (부산대학교 기계공학부, 기계기술연구소) ;
  • 조승완 (부산대학교 기계공학부, 기계기술연구소) ;
  • 강길영 (부산대학교 기계공학부, 기계기술연구소) ;
  • 유재현 (부산대학교 기계공학부, 기계기술연구소)
  • Published : 2007.06.01

Abstract

This study was conducted to investigate the flow and combustion characteristic of the experimental burner which was manufactured for the reflection of the oven and broil burner features. As slot shape, spacing between slots, and slot arrangement of the exit area which emits the mixing gas are different in case of oven burners and broil turners, the purpose of this study is to know the affection of the flame interaction and combustion characteristic according to the change of shape factors such as slot shape, slot arrangement, and slot-to-slot spacing. With no relation of the slot shape, as the spacing between slots became narrow, the occurrence of a lift-flame was delayed. So the combustion was possible in the leaner region, but the appearance of yellow-tip became a little fast. Slit slot port had the broadest operating range among the other slot shapes. Specially, from the side of lift-flame, as the jet that spreads downstream in the longitudinal slot was nearly circular just a few slot lengths away from the orifice, slot-to-slot spacing of the Slit port was closer than the other ports. These results could be expected through the computer numerical method and had a good agreement. As the spacing between slots increased, in case of Slit and Mix port, NOx emission rate was constant or decreased, but the NOx emission of Hole port was increased. CO emission rate of Slit and Hole port was increased as the slot-to-slot spacing was broadened.

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